The observation periscope is meant for just that-observation. In real life it had a wider field of vision, allowed in more light, and the lens could be cranked up 85 degrees to look for badnasty flying things. Also it was easier to raise it and look around than to climb up into the conning tower to use the attack 'scope.
The game doesn't make a distinction where light is concerned, but all the other things are modelled. If you click on things to get around (as opposed to just hitting keys) the O-'scope really does become easier to use to look around just before you surface.
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“Never do anything you can't take back.”
—Rocky Russo
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